Sound amplifier



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Sept. 29, 1931.

Sept. 29, 1931.

J. P. SULLIVAN SOUND AMPLIFIER 2 Sheets-Shoat 2 Filed May 15, 1930 Patented Sept. 29, 1931 PATENT OFFICE A JOSEPH PATRICK SULLIVAN, OF EDMONTON, ALBERTA, CANADA SOUND AMPLIFIER Application filedfMay 15, 1930, Serial No. 452,776, and in Canada January 3, 1930.

The present invention relates to improvements in sound amplifiers and more especially to a type in which there may be provided a multiplicity of sound amplifying units, suplfli plied with a varied number of horns of different lengths.

One of the objects of this invention is to provide an amplifying unit capable of assembly with other additional and similar units so as to constitute a complete amplifying instrument.

Another object of my invention is to provide an amplifier with different sized horns, in order to harmonize the sound at its source, and in this manner absorb the metallic sound at its source.

A further object of my invention is to provide a series of adjustable shutters, thereby providing means for closing off any individ ual horn or series of horns at will.

In the accompanying drawings:

Figure 1 is a front view.

Fig. 2 is a side elevation thereof.

Fig. 3 is a sectional view on line 33 of Fig. 1.

Fig. 4 is a Fig. 1.

Fig. 5 is a sectional view on line 55 of Fig. 2.

The device consists of a plurality of amplifying units, each consisting of upper. and lower mating sections 3 and 4 to provide amplifying chambers 11. The units are arranged in upper and lower rows, the units of the upper row lying flush upon the units of the lower row and in which the units are'arranged in pairs. As illustrated, each row consists of five units, but it will be, of course, understood that the number of units may be increased or decreased, as desired.

The units when in assembled relationship are supported by a stand 5 of any preferable design.

As will be observed each unit is of rectangular formation and at the exterior wall of each unit is provided an opening 6, while the contacting inner walls of the .unit are provided with openings 7, in order to place the Various units in communication with each '4 other.

sectional view on line 44 of Used in connection with the units are horns which include tubes 6 which have connected therewith the horns 7 said tubes having flanges 8 carried thereby to secure the same to the outer faces of the various units in or- 66 der that the openings of the units will coincide with the respective tubes. The number of horns will correspond to the number of openings 6 and it will be observed u on reference to Figures 1 and 2 that the orns 7 are disposed horizontally and that the tubes 6 extend from the front, rear, end and bottoms of the various units, and the length of the tubes as well as the horns, vary, thus the horns are so arranged that the'sound emitting ends are located in advance of the amplifying units.

Slidably interfitted between the junctures of the tubes 6' and the horns 7 are chutes 9 having openings 9 therein adapted to be moved into or out of registration with the bores of the tubes and horns. The shutters are provided with handles 10 to facilitate sliding thereof. A

Shutters 13 are slidable between the up- 7 per and lower units 1 and 2, to control the passage of sound waves from the chambers 11 of the lower units into the upper units through the openings 7 said shutters having actuating handles 15 carried thereby to facilitate sliding thereof. Arranged between the vertical contacting faces of the upper and lower units are shutters 14 having handles 16, and similar shutters 10 are associated with the various openings 6 of the units to control the passage of sound Waves from the respective chambers 11 into the associated tubes 6'. It will, be of course, understood that the shutters '10, 13 and 14 are similar to theshutters 9 and are provided with sound passages operable for registration with the associated openings of the cooperating units.

The units 3 have hangers 17 fixed to their upper sections for supporting the loud speakers 12, which may be of standard make.

'Bolts 4 are passed through the units to retain the same in fixed assembled relationship. a

7 The horns 7 as stated, vary in size, and since they are detachably connected with the 7 through the'horns. V

respective tubes, it is obvious that the same may be interchanged to vary the sound, when desired.

Obviously the shutters 10 are operable to shut oil the sound from any of the horn ensembles, while the shutters 9 are operable to shut off the soundto'the individual horns,

while the shutters 13 when moved in one direction, act to cut ofi sound communication from the lower chambers with the upper chambers; By moving the shutters 14 to close the openings between the chambers 11, lateral passage of sound waves-from one chamber 11 to the other will be prevented. I

devices located in certain'chambers, said units amplifying chambers therein, sound emitting having openings therein afiording communi- V catlon between the amplifying chambers when said units are in assembled relationship, shutters shdable between the units for controlling the passage of sound waves from one unit to the other, horns communicating with the chambers, and means for controlling the passage of sound waves from the chambers to the hornsf In testimony whereof I affix my'signature.

JOSEPH PATRICK SULLIVAN.

. From the foregoing it"will be obvious'that l sound generated by the speakers 12 will be 1 natural tone.

I What I claim as my invention is:

1. An-amplifier consisting of a plurality of superposed rowsof units, means for placing the units in communication with each other,

sound emitting devices in certain of the units,

a; horn connected with eachrunit, and means for controlling the passage of sound waves from one unit to the other and to the horns.

'2. An amplifier consisting of a plurality of superposed rows of units, said units conslstlng of matlng sections providlng ampllfy ing chambers, means afiording communicat1on between the chambers of each row, sound emittlng devlces in certain of the'chambers,

horns connected with the-units, shuttersslidably associated with the units for controlling the passage of sound waves from one unit to the other and from the unitstothe horns.

8. An amplifier consistingrof upper and lower rows of units having amplifying cham-- bers thereln, each rowincludlng a plurality:

of paired units, the units of the upper and lower rows 'having inter-communicating openings formed therein, horns connected 7 witheach un t and communicatlng with the chambers thereof, sound emitting devices located in certain of thechambe-rs, and means v V for controlling. the passage of sound waves 7 from'one'unit into the other, and to the horn.

4. An amplifier consisting of a plurality of superposed .units including inter-communieating amplifying chambers, sound emitting devices located in certain of the chambers, tubes connected with theunits,horns varying in length interchangeably connected with the ..tubes, and means for controlling the passage of sound waves fromthe chambers to the horns. V

An amplifier comprising-a pluralityof I f unitsof rectangular formation, and having. 

